CN110295869B - Expansion liner tube for repeated fracturing and repeated fracturing method - Google Patents
Expansion liner tube for repeated fracturing and repeated fracturing method Download PDFInfo
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- CN110295869B CN110295869B CN201910659978.1A CN201910659978A CN110295869B CN 110295869 B CN110295869 B CN 110295869B CN 201910659978 A CN201910659978 A CN 201910659978A CN 110295869 B CN110295869 B CN 110295869B
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/02—Subsoil filtering
- E21B43/10—Setting of casings, screens, liners or the like in wells
- E21B43/103—Setting of casings, screens, liners or the like in wells of expandable casings, screens, liners, or the like
- E21B43/105—Expanding tools specially adapted therefor
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/02—Subsoil filtering
- E21B43/10—Setting of casings, screens, liners or the like in wells
- E21B43/103—Setting of casings, screens, liners or the like in wells of expandable casings, screens, liners, or the like
- E21B43/108—Expandable screens or perforated liners
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
- Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
Abstract
The invention discloses an expanded liner tube for repeated fracturing and a repeated fracturing method. The expansion liner tube is a hollow circular tube, an expansion mandrel is arranged in the expansion liner tube, the expansion mandrel moves axially along the expansion liner tube and extrudes, a new closed shaft is formed after the expansion liner tube is subjected to radial plastic deformation and is connected with the perforated sleeve tube, and the closed shaft is used for repeated fracturing. Compared with the existing repeated fracturing technology, the method adopts the expansion liner tube for repeated fracturing, reduces the expansion difficulty, improves the strength and the sealing performance of the expanded liner tube, overcomes the defect that the joint is easy to separate, and can improve the oil gas yield by rebuilding the integrity of the shaft.
Description
Technical Field
The invention relates to the technical field of oil and gas field development, in particular to an expansion liner tube for repeated fracturing and a repeated fracturing method.
Background
The low-permeability oil-gas reservoir is important for the energy pattern of China and even the whole world, and the ultra-low pore and ultra-low permeability characteristics of the low-permeability reservoir ensure that the low-permeability reservoir can realize industrialized exploitation only by means of hydraulic fracturing. However, hypotonic reservoirs, particularly shale gas wells, are prone to fracture failure due to the production process after hydraulic fracturing. Production typically drops to half of the peak within half a year. The technique of repeated fracturing is being valued as a relatively economical and efficient means.
A great deal of research at home and abroad shows that the repeated fracturing is one of effective measures for improving the yield of the real estate well. The process of reusing the well section which is subjected to one or more fracturing reconstruction measures for construction reconstruction is repeated fracturing. Repeated fracturing may generally restore production to approximately the original state, as re-fracturing may open up the reservoir that was not in communication with the primary fracture and may allow the fractures in the near wellbore section to be re-engineered.
The point in time of the re-fracturing is usually late in the development of the gas reservoir. The stress field around the wellbore constantly changes with the production of hydrocarbons, at which time the flow direction of the fracturing fluid is difficult to control and predict. It is difficult for the constructor to accurately monitor the fracture propagation direction by means of the prior art, which leads to high risk and uncertainty of repeated fracturing construction. If there is a high aquifer near the wellbore, the fracture may pass through the aquifer, resulting in water production from the wellbore. In areas with more densely arranged wells, fracturing fluid may also flow into the adjacent wells, causing the natural pressure of the two wells to dissipate and produce fluid, which is eventually discarded.
When the repeated fracturing is carried out, the integrity of the rebuilt shaft plays an important role, and the defects of high construction difficulty, low tool reliability, poor sealing performance, easy separation of joints and the like exist when a new shaft is built in the prior art.
Disclosure of Invention
In order to achieve the above object, the present invention provides an expanded liner for repeated fracturing and a repeated fracturing method, wherein the technical scheme is as follows:
according to a first aspect of the present invention, there is provided an expanded liner for repeated fracturing, the expanded liner being a hollow round tube,
an expansion mandrel is arranged in the expansion liner tube, the expansion mandrel moves axially along the expansion liner tube and extrudes the expansion liner tube, the expansion liner tube is radially plastically deformed and then is connected with the perforated sleeve tube to form a new closed shaft, and the closed shaft is used for repeated fracturing.
Optionally, the expansion liner inner wall surface is coated with a coating.
Optionally, the outer surfaces of the two ends of the expanded liner are provided with first elastic sealing mechanisms, and the expanded liner is radially deformed and then is sealed with the perforated casing through the first elastic sealing mechanisms.
Optionally, the expansion mandrel comprises a lubricating auxiliary section, an expansion section and a sizing section which are sequentially connected along an axis, the lubricating auxiliary section and the sizing section are cylinders with certain outer diameters, the outer diameter of the lubricating auxiliary section is smaller than that of the sizing section, the expansion section is a reducing cone, and two ends of the expansion section are respectively connected with the lubricating auxiliary section and the sizing section.
Optionally, the sizing section of the expansion mandrel is provided with an annular groove in which a second sealing means is mounted, the second sealing means effecting a seal between the expansion mandrel and the expansion liner.
Optionally, alloy blocks are uniformly embedded on the outer surface of the expansion section of the expansion mandrel, and lubricating liquid is coated between the alloy blocks.
Optionally, the expansion mandrel is provided with a flow guiding through hole in the axial direction.
Optionally, a male joint and a female joint are respectively arranged at two ends of the expansion liner pipe, the male joint and the female joint are used for connecting adjacent expansion liner pipes, male threads are arranged on the outer surface of the male joint, female threads are arranged on the inner surface of the female joint, and the male threads and the female threads adopt barb type trapezoidal teeth.
Optionally, a sealing groove is provided in the female thread root of the box, and an elastic sealing ring is provided in the sealing groove.
Optionally, a sealing groove is provided in the male thread root of the male joint, and an elastic sealing ring is provided in the sealing groove.
Optionally, a protrusion is provided at the trailing end of the male thread of the expandable liner, the protrusion mating with a corresponding groove in the root of the female thread.
Optionally, a resilient sealing layer is coated on the barb-type trapezoidal teeth.
According to a second aspect of the present invention there is provided a method of re-fracturing for an expanded liner for re-fracturing of the first aspect, the method comprising:
a. determining the expanded liner model from the wellbore inner diameter;
b. determining the plugging position and the plugging length of the expansion liner according to the position of an original perforation hole, the depth of a reservoir stratum and the length of a horizontal section;
c. before installing the expansion liner pipe, using a pipe column scraper-milling device, a short section and a conical scraper-milling device drilling tool combination which are matched with the inner diameter of a shaft to scrape and mill off cement residues on the inner wall of the casing;
d. lowering the expanded liner to the wellbore at the predetermined location and initiating pressurization to expand the expanded liner;
e. setting a plurality of sections of expansion liner pipes according to construction requirements;
f. and closing the well mouth, and using clear water to perform low-pressure test on the upper seal, stabilizing the pressure for 5min, wherein if the pressure is not reduced, the pressure test is qualified.
g. Milling the bottom plugging accessory of the expansion pipe by using a drilling tool combination of a pipe column milling cutter and a short section, namely a conical milling cutter which are matched with the inner diameter of the expansion liner pipe to communicate the whole expansion pipe;
h. after the expansion pipes are communicated, carrying out a whole-well target pressure test by using fracturing fluid, wherein the target pressure is the highest construction pressure of repeated fracturing plus a safety margin of 5MPa, stabilizing the pressure for 5min, and if the pressure is not reduced, the whole-well target pressure test is qualified, and tripping out the drill;
i. and (5) completing pressure test, and performing perforation and repeated fracturing construction according to the perforation design and the fracturing design.
The invention has the beneficial effects that:
1) the expansion liner tube can completely block the original non-productive perforation position and rebuild the integrity of the internal pressure of the shaft. Compared with the traditional steering technology, plugging is more thorough, and the success rate of fracturing is improved.
2) After the expansion liner pipe is plugged, an operator can independently process the fracturing process of each crack like the initial well completion, so that the flow direction of fracturing fluid can be predicted more accurately, and the development of the crack can be controlled.
3) The use of an expanded liner greatly reduces the loss of wellbore internal diameter, saving valuable wellbore space.
4) Compared with the existing repeated fracturing technology, the method adopts the expanded liner tube for repeated fracturing, reduces the expansion difficulty, improves the strength and the sealing performance of the expanded liner tube, and overcomes the defect that the joint is easy to separate.
Drawings
FIG. 1 shows a schematic structural view of an expandable liner for repeated fracturing in accordance with an exemplary embodiment;
FIG. 2 illustrates a schematic structural view of an expansion mandrel in accordance with an exemplary embodiment;
FIG. 3 shows a schematic structural view of an expanded liner joint according to an exemplary embodiment.
With the above figures, certain embodiments of the invention have been illustrated and described in more detail below. The drawings and the description are not intended to limit the scope of the inventive concept in any way, but rather to illustrate it by those skilled in the art with reference to specific embodiments.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.
FIG. 1 is a schematic diagram of an expandable liner for repeated fracturing, according to an exemplary embodiment. An expandable liner for repeated fracturing, comprising:
the expansion liner tube 1 is a hollow circular tube, an expansion mandrel 3 is arranged in the expansion liner tube 1, the expansion mandrel 3 moves axially along the expansion liner tube 1 and extrudes the expansion liner tube 1, the expansion liner tube 1 is in radial plastic deformation and then contacts with the perforated casing 2 to form a new closed shaft, and the closed shaft can be used for repeated fracturing.
It is noted that the choice of material for the expanded liner 1 requires consideration of lower yield strength, higher uniform elongation, good work-hardening capability and higher tensile strength in high temperature downhole environments, and therefore one skilled in the art can select a high strength DP steel or a high manganese austenitic TWIP/TRIP steel that meets the above requirements.
Optionally, the inner wall surface of the expansion liner 1 is coated with a coating.
The coating can avoid expansion liner pipe 1 to produce the corruption in the environment in pit on the one hand, reduces intensity, and on the other hand the coating also can be for providing the lubrication action between expansion core axle 3 and the expansion liner pipe 1, and is heavy and play the effect that reduces the expansive force, improve the operation success rate. In view of the fact that graphite has good corrosion resistance and can play a good lubricating role, graphite can be selected as the coating, and in addition, other coatings which can adapt to the underground high-temperature and high-pressure environment can be selected by a person skilled in the art by combining with the common technical means in the field.
Optionally, the outer surfaces of both ends of the expanded liner 1 are provided with first elastic sealing mechanisms 4, and the expanded liner 1 is radially deformed and then sealed with the perforated casing 2 through the first elastic sealing mechanisms 4.
In order to adapt to the high-temperature and high-pressure environment in the well, the material of the first elastic sealing mechanism 4 may be one of nitrile rubber material, fluorinated rubber material, asahi vier viton rubber material or acrylonitrile butadiene nitrile rubber material, and the above materials have good deformability and high pressure resistance. In order to ensure the bonding strength of the first elastic sealing means 4 to the outer surface of the expandable liner 1, a heat-curing bonding process may be selected to bond the first elastic sealing means 4 to the expandable liner 1.
Optionally, as shown in fig. 2, the expansion mandrel 3 includes a lubrication auxiliary section 6, an expansion section 7, and a sizing section 8, which are sequentially connected along an axis, where the lubrication auxiliary section 6 and the sizing section 8 are cylinders with a fixed outer diameter, the outer diameter of the lubrication auxiliary section 6 is smaller than the outer diameter of the sizing section 8, the expansion section 7 is a reducing cone, and two ends of the expansion section 7 are respectively connected to the lubrication auxiliary section 6 and the sizing section 8.
It should be noted that when the expanded liner 1 is deformed, the sizing section 8 will locally roundness the expanded liner 1 so that it is no longer greatly deformed. Axial displacement of the expansion section 7 causes permanent circumferential plastic deformation of the expanded liner 1, increasing the diameter of the expanded liner 1. The auxiliary section 6 is lubricated to ensure that the expansion mandrel 3 is centred within the expansion liner 1 to ensure that the expansion liner 1 deforms uniformly.
Optionally, the sizing section 8 of the expansion mandrel 3 is provided with an annular groove 9, in which annular groove 9 a second sealing means 5 is mounted, the second sealing means 5 effecting a seal between the expansion mandrel 3 and the expansion liner 1. Due to the existence of the second sealing device 5, fluid cannot leak from a gap between the expansion mandrel 3 and the pipe wall of the expansion liner pipe 1, so that good sealing is formed at the sizing section 8 of the expansion mandrel 3, and the phenomenon that the expansion mandrel 3 cannot move axially due to pressure reduction caused by liquid loss is avoided.
Alternatively, the outer surface of the expansion section 7 of the expansion mandrel 3 is uniformly embedded with alloy blocks 10, and lubricating liquid is coated between the alloy blocks 10. Because the alloy blocks 10 have high hardness, the expansion mandrel 3 can be prevented from cracking due to overlarge stress, and in addition, lubricating liquid can be coated among the alloy blocks, so that the friction force between the sizing section 8 and the wall surface of the expansion pipe in the expansion process is reduced, and the expansion failure of the wall surface of the expansion liner pipe 1 is avoided.
Optionally, the expansion mandrel 3 is axially provided with a flow guiding through hole 11, the flow guiding through hole 11 can allow liquid to flow through the expansion mandrel 3, and high-pressure fluid can provide pressure at the end of the expansion mandrel 3 after passing through the flow guiding through hole, so as to push the axial movement of the axial mandrel 3. The pressure difference at two ends of the expansion mandrel can be smaller by arranging the axial through hole 11, so that the expansion mandrel 3 is prevented from being damaged, and the force of axial movement can be reduced, so that the construction difficulty is reduced. Liner expansion is more likely to occur under the dual other effects of axial drag and fluid pressure as the liner expands.
It should be noted that the material of the expansion mandrel 3 may preferably be artificial polycrystalline diamond, chrome-plated steel, or a certain amount of titanium carbide may be added to the tungsten carbide-based hard alloy, and the material has very high hardness and good wear resistance, and can meet the performance requirements of the expansion mandrel 3.
In the art, coupling connections are typically used when connecting adjacent casings, but the presence of couplings can result in the expanded liner requiring a greater expansion force when connecting, and therefore coupling connections are not used in the present invention. The invention also improves and optimizes the connection mode of the joint.
FIG. 3 is a schematic diagram of a joint according to an exemplary embodiment.
The expanded liner 1 is joined to ensure good joint strength and sealing at the joint between the mutually expanded liners 1, otherwise liquid can enter the gap between the male and female joints to corrode the expanded liner 1, thereby causing the expanded liner 1 to lose strength and possibly causing repeated fracturing failures. The present invention is therefore improved with respect to the problems of joint strength and sealing of the expanded liner 1 in the following respects.
Alternatively, the design is made in terms of thread profile.
Preferably, the expansion liner 1 is provided with a male joint 15 and a female joint 12 at two ends respectively, the male joint 15 and the female joint 12 are used for connecting adjacent expansion liner 1, the outer surface of the male joint 15 is provided with male threads 16, the inner surface of the female joint 12 is provided with female threads 13, and the male threads 16 and the female threads 13 adopt barb type trapezoidal teeth.
Optionally, in order to ensure sealing, a sealing ring is used at the connecting part, and for the installation position of the sealing ring, in order to ensure the strength of the threaded connection part, the installation position is optimized by a person skilled in the art, and the installation position of the sealing ring is selected at the root of the thread, so that the influence of the sealing groove on the connection strength is reduced.
Specifically, a sealing groove 14 is formed at the root of the female thread 13 of the female joint 12, and an elastic sealing ring is arranged in the sealing groove 14 and is pressed against the end of the male thread 16 of the male joint 15 to generate contact pressure, so that the joint is sealed.
A sealing groove 17 is formed in the root of the male thread 16 of the male joint 15, an elastic sealing ring is arranged in the sealing groove 17, and the elastic sealing ring is pressed with the end portion of the female thread 13 of the female joint 12 to generate contact pressure, so that the joint is sealed.
Alternatively, the disengagement of the joint may occur due to excessive deformation of the male thread 16 of the expanded liner 1 during expansion, which may result in separation of the male and female threads between adjacent expanded liners 1. Therefore, in order to avoid the situation, the ansisy software is adopted to carry out indoor simulation and optimization in advance and then carry out outdoor experiments, and the mode of arranging the bulges at the interfaces is provided, so that the joints between adjacent joints can be prevented from being separated under the condition of meeting the expansion strength. The invention thus achieves prevention of the disconnection of the joint by providing the expansion liner 1 with a projection 18 at the tail end of the male thread 16 and a snap fit with a corresponding recess at the root of the female thread.
Alternatively, because of machining accuracy and the like when machining threads, some voids may exist between the trapezoidal teeth when the male thread of the pin and the female thread of the box are mated with each other, and the existence of these voids may also cause a decrease in sealability. Therefore, in the present invention, the thread teeth are coated with the elastic sealing layer. The elastic sealing layer is in a non-solidified state before the liner pipe is expanded, is a viscous paste or a viscous liquid, is solidified into a cementing solid after the liner pipe is expanded, and provides radial pressure between threads through elastic deformation of the cementing solid, so that the sealing performance is improved. The elastic sealing layer can be selected from polysulfide sealant or polyurethane sealant.
The present invention also provides a method of re-fracturing an expanded liner for re-fracturing of the first aspect, the method comprising:
determining the type of the expansion liner according to the inner diameter of the shaft;
determining the plugging position and the plugging length of the expansion liner according to the position of the original perforation hole, the depth of the reservoir and the length of the horizontal section;
before installing the expansion liner tube, a drilling tool combination of a tubular column scraping and milling device, a short section and a conical scraping and milling device which are matched with the inner diameter of a shaft is used for scraping and milling cement residues on the inner wall of the casing tube, so that the liner tube can smoothly reach a preset position;
lowering the expanded liner to a predetermined location in the wellbore and initiating pressurisation to expand the expanded liner;
setting a plurality of sections of expansion liner pipes according to construction requirements, wherein the expansion liner pipes are butted together through joints;
closing the wellhead, using clear water to perform low-pressure test on the upper seal, and if the pressure is stabilized for 5min and is not reduced, the pressure test is qualified;
milling the bottom plugging accessory of the expansion pipe by using a drilling tool combination of a pipe column milling cutter and a short section, namely a conical milling cutter which are matched with the inner diameter of the expansion liner pipe to communicate the whole expansion pipe;
after the expansion pipes are communicated, fracturing fluid is adopted to carry out a whole-well target pressure test, the target pressure is the highest construction pressure of repeated fracturing plus a safety margin of 5MPa, the pressure is stabilized for 5min, and if the pressure is not reduced, the whole-well target pressure test is qualified, and the drill bit is pulled out;
and performing perforation and repeated fracturing construction according to the perforation design and the fracturing design.
It should be noted that what is to be detected by the target pressure test is not only whether the internal pressure resistance strength of the expanded pipe body is qualified, but also whether the sealing performance of the expanded screw thread and the external pipe sealing mechanism can meet the sealing requirement of repeated fracturing.
In summary, the present invention is not limited to the above-mentioned embodiments, and those skilled in the art can propose other embodiments within the technical teaching of the present invention, but the embodiments are included in the scope of the present invention.
Claims (1)
1. A repeated fracturing method comprises the steps of performing repeated fracturing by using an expansion liner, wherein the expansion liner is a hollow circular tube, an expansion mandrel is arranged in the expansion liner, the expansion mandrel moves axially along the expansion liner and extrudes the expansion liner, the expansion liner is subjected to radial plastic deformation and then is connected with a perforated casing pipe to form a new closed shaft, and the closed shaft is used for repeated fracturing; a male joint and a female joint are respectively arranged at two ends of the expansion liner pipe and are used for connecting adjacent expansion liner pipes, male threads are arranged on the outer surface of the male joint, female threads are arranged on the inner surface of the female joint, and the male threads and the female threads adopt barb type trapezoidal teeth; a bulge is arranged at the tail end of the male thread of the expansion liner pipe and is matched with a corresponding groove at the root of the female thread;
the method comprises the following steps:
a. determining the expanded liner model from the wellbore inner diameter;
b. determining the plugging position and the plugging length of the expansion liner according to the position of an original perforation hole, the depth of a reservoir stratum and the length of a horizontal section;
c. before installing the expansion liner pipe, using a pipe column scraper-milling device, a short section and a conical scraper-milling device drilling tool combination which are matched with the inner diameter of a shaft to scrape and mill off cement residues on the inner wall of the casing;
d. lowering the expanded liner to the wellbore at the predetermined location and initiating pressurization to expand the expanded liner;
e. setting a plurality of sections of expansion liner pipes according to construction requirements;
f. closing the well mouth, using clear water to perform low-pressure test on the upper seal, stabilizing the pressure for 5min, and if the pressure is not reduced, indicating that the pressure test is qualified;
g. milling the bottom plugging accessory of the expansion pipe by using a drilling tool combination of a pipe column milling cutter and a short section, namely a conical milling cutter which are matched with the inner diameter of the expansion liner pipe to communicate the whole expansion pipe;
h. after the expansion pipes are communicated, carrying out a whole-well target pressure test by using fracturing fluid, wherein the target pressure is the highest construction pressure of repeated fracturing plus a safety margin of 5MPa, stabilizing the pressure for 5min, and if the pressure is not reduced, the whole-well target pressure test is qualified, and tripping out the drill;
i. and (5) completing pressure test, and performing perforation and repeated fracturing construction according to the perforation design and the fracturing design.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910659978.1A CN110295869B (en) | 2019-07-22 | 2019-07-22 | Expansion liner tube for repeated fracturing and repeated fracturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910659978.1A CN110295869B (en) | 2019-07-22 | 2019-07-22 | Expansion liner tube for repeated fracturing and repeated fracturing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110295869A CN110295869A (en) | 2019-10-01 |
| CN110295869B true CN110295869B (en) | 2020-07-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910659978.1A Expired - Fee Related CN110295869B (en) | 2019-07-22 | 2019-07-22 | Expansion liner tube for repeated fracturing and repeated fracturing method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US11898422B2 (en) | 2020-11-03 | 2024-02-13 | Saudi Arabian Oil Company | Diamond coating on the cone for expandable tubulars |
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| CN111058817B (en) * | 2019-11-12 | 2022-03-29 | 中国石油天然气股份有限公司 | Multi-section perforation fracturing horizontal well shaft integrity recovery method |
| CN112112635B (en) * | 2020-10-09 | 2022-10-18 | 吕梁学院 | Coal-bed gas well shaft leakage detection device and operation method thereof |
| CN113309474B (en) * | 2021-07-15 | 2023-02-07 | 西安石油大学 | Metal sealing joint of expansion casing |
| CN114382455B (en) * | 2022-01-12 | 2023-10-03 | 北京科源博慧技术发展有限公司 | Shale gas horizontal well repeated fracturing method |
| CN115012896B (en) * | 2022-06-27 | 2024-02-23 | 中国石油天然气集团有限公司 | Wellbore reconstruction method for repeated fracturing of oil and gas well |
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| CN110295869A (en) | 2019-10-01 |
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